<html>
  <head>
    <title>A canvas globalCompositeOperation with shadow</title>
    <script>
    var compositeTypes = [
      'difference', 'exclusion', 'hue', 'saturation', 'color',
      'luminosity'
    ];
    function draw(){
      for (i=0;i<compositeTypes.length;i++){
        var label = document.createTextNode(compositeTypes[i]);
        document.getElementById('lab'+i).appendChild(label);
        var canvas = document.getElementById('tut'+i);
        canvas.width = 80;
        canvas.height = 80;
        var ctx = canvas.getContext('2d');

        // draw rectangle
        ctx.fillStyle = "#09f";
        ctx.fillRect(5,5,45,45);

        // set composite property
        ctx.globalCompositeOperation = compositeTypes[i];

        // draw rectangle with shadow
        ctx.fillStyle = "#f30";
        ctx.shadowColor = 'blue';
        ctx.shadowBlur = 10;
        ctx.shadowOffsetX = 10;
        ctx.shadowOffsetY = -10;
        ctx.fillRect(20,25,45,45);
      }
    }
    </script>
    <style type="text/css">
      body { margin: 20px; font-family: arial,verdana,helvetica; background: #fff;}
      h1 { font-size: 140%; font-weight:normal; color: #036; border-bottom: 1px solid #ccc; }
      canvas { border: 2px solid #000; margin-bottom: 5px; }
      td { padding: 4px; }
      pre { float:left; display:block; background: rgb(238,238,238); border: 1px dashed #666; padding: 15px 20px; margin: 0 0 10px 0; }
    </style>
  </head>
  <body onload="draw();">
    <div>
      <table>
        <tr>
          <td><canvas id="tut0"></canvas><br/><label id="lab0"></label></td>
          <td><canvas id="tut1"></canvas><br/><label id="lab1"></label></td>
          <td><canvas id="tut2"></canvas><br/><label id="lab2"></label></td>
          <td><canvas id="tut3"></canvas><br/><label id="lab3"></label></td>
          <td><canvas id="tut4"></canvas><br/><label id="lab4"></label></td>
          <td><canvas id="tut5"></canvas><br/><label id="lab5"></label></td>
        </tr>
      </table>
    </div>
  </body>
</html>
